British Homoptera-Cicadina. 23 
The difference in habitat, the larger size of both sexes, 
and the uniform coloration of the female, all which 
matters are very constant, seem to me to indicate a 
distinct species, although I have not detected any 
appreciable structural differences in the male genitalia 
of the two forms. According to a specimen labelled by 
Dr. Signoret my ¢ is the polystolus of Fieber; the 
polystolus of Scott seems to be my a. 
4. Acocephalus brunneo-bifasciatus, Geoffr. 
Cicada brunneo-bifasciata, Geoffr., Hist. Abr. Ins., 
425, 22. 
C. serratule, Fab., Ent. Sys., iv., 41, 68. 
Jassus serratule, H.-Scff., Deuts. Ins., 130, 5. 
Acocephalus serratule, Kirschb., Cicad., 78, 12; J. 
Sahl., Not. Fenn., xii., 362, 6. 
A. brunneo-bifasciatus, Sign., Ess. Jass., 86,10, pl. i, 
fie. 15. 
3. Very similar in appearance to the ordinary form of the 
preceding species, but the crown, which is about as long as the 
pronotum, and has a fine middle keel, is feebly convex instead of 
impressed. The following differences in coloration, which are 
sufficiently constant, facilitate its separation from albifrons: the 
hind margin of the pronotum is broadly white, the space between 
the first and second white bands on the elytra is equal in depth 
of colour to the space between the second white band and the 
white space at the apex, which is seldom or never the case in the 
ordinary form of albifrons, and the apices of the tibie and the 
tarsi of the front pairs of legs are much more conspicuously black. 
Length, 4 mm. 
@. Ido not know this sex, but, judging from descriptions, it is 
greyish yellow, more or less closely speckled with fuscous, with 
some whitish spots on the suture, and the apical areas filled up 
with fuscous. 
Amongst herbage at the roots of trees, &c.; not 
common. 
5. Acocephalus histrionicus, Fab. 
Cercopis histrionicus, Fab., Ent. Syst., iv., 56, 44; 
Sys. Rhyn., 98, 62. 
Acocephalus histrionicus, Flor, Rhyn. Liv., ii., 208, 5 ; 
Marsh., Ent. Mo. Mag., u1., 179, 5; Kirschb., 
Cicad., 77,9; J. Sahl., Not. Fenn., xii., 364, 8; 
Sign., Ess. Jass., 38, 11, pl. ii., fig. 16. 
A. arenicola, Marsh., l. c., 180, 6, sec. spec. comm. 
